Querys for multiple databases at the same time

Hi there, I was typing a piece of code to connect to my MySQL server, that has 2 Databases (lets call them Y and Z). So, what i was trying to do was searching on Y some data that a user entered to Unity, and if the data existed, the code would take some data from Z and show it to the user.

So, as i'm a newbie with databases, I was wondering if it is possible to create the two querys at the same time without having to close one connection and then connect to the other database.

Thanks a lot.