1. A computer-implemented method for generating query constraints for querying access rights using affinities for entities, comprising: receiving, at a load management system, a first communication from a messaging system, the first communication corresponding to affinity data associated with a user identifier, the affinity data including one or more affinity indications defined at the messaging system, the definition of the one or more affinity indications being based on input received at the messaging system from a device operated by a user associated with the user identifier, and the one or more affinity indications representing the user's affinity for an entity; determining, at the load management system, one or more query constraints based on the first communication, each of the one or more query constraints being determined using the affinity data, such that an affinity indication corresponds to a query constraint; generating, at the load management system, a query communication including the one or more query constraints; transmitting, at the load management system, the query communication to one or more data stores, the one or more data stores storing resource data for a plurality of resources associated with the entity, each resource of the plurality of resources corresponding to a plurality of access rights, and each access right of the plurality of access rights facilitating access to the resource for a defined time period; performing, at the one or more data stores, a query of the one or more data stores, the query being performed using the one or more query constraints included in the query communication; receiving, at the load management system, a query response communication from the one or more data stores, the query response communication including a result of the query, the result of the query identifying one or more access rights associated with at least one resource of the plurality of resources, and each identified one or more access rights satisfying a query constraint of the one or more query constraints; and transmitting, at the load management system, a second communication to the device operated by the user, the second communication including an identifier for the one or more access rights.