I always bring food on the plane to eat. Why spend an extra hour in the airport when you can take care of it while you're in the air.
Wow, great site! So, couple of places are open until 10; several places are open until the last flight arrives. McCoy's is open until 12:30. McDonald's in the main terminal is open 24 hours.The website will be able to help, as it has operating hours listed: https://www.orlandoairports.net/getting-around-mco/shops-restaurants/
Have a fun time.