Malaga airport has both short term and long term car parks.
Located 5 minutes away from the departures terminal, it has a free bus service between the terminal building and the car park.
When you return you can catch a bus which goes from the arrivals terminal to the P3 car park.
This car parking is for mainly for people who wish to park their car for 4 days or less, it is also a good place to park if you are dropping someone off at the airport.
The location of this car park (in front of the Terminal 2 and Terminal 3 building) makes it a good place to park your vehicle if you are only going to leave it for 30 minutes or less.
For more information about where the long term and short term car parks are located and their prices by visiting the official page of the airports operator (AENA).