Moldy food left in oven, safe to cook?
You will have mold spores in your oven, but the temperature will take care of them. All it means is that you might have some mold spore dust on your food later, which you won't even notice and is perfectly safe. Next time give your oven a good wipe-down with a damp towel before using it again. 

There's no need to toss a pan after that sort of thing, just clean it with soapy water and it should be good to go.