I'm not have shortcut about Selection to Cursor I have blender v2.79. But i don't have shortcut "Selection to Cursor (shift+ctrl+Y)". Have anyone know how to Assign a shortcut?
https://youtu.be/W5Qp2pUMeQE?t=4m56s
There is a custom shortcut defined in the blender version he is using.

You can do this by opening the menu, right clicking on the item, hovering over the box and putting in a shortcut.