WordPress: Combine external database table and WP_Query

I’ve got a custom post type ‘locations’ and each location has a postal code.

And I have another table with all postal codes of the country and their coordinates (longitude, latitude).

Now I want to display all existing locations within a given radius around a given postal code. I do know how to calculate the distance.

Do I have to select all possible postal codes first and then execute WP_Query with the meta_key = ‘postalcode’ and the meta_value IN [My list of possible postal codes], or is there any way to directly JOIN the tables using WP_Query?

I do need WP_Query, because I want to use WordPress features like Pagination.

Read more here: WordPress: Combine external database table and WP_Query

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