Query Works - How to optimize it further.

Spoiler: Since I'm a beginning I assume the answer is, absolutely yes.

Tables Job_Types and Job_Type_Listing

Goal: A user is able to view a list of Job Types and click on them. However, I only want to display Job Types that actually have at least one listing.

   $jobtypes = DB::table('job_types')
                    ->join('job_type_listing', function($join) {
                        $join->on('job_types.id', '=', 'job_type_listing.job_type_id');
                    })
                    ->select('job_types.name','job_types.slug')
                    ->where('job_type_listing.job_type_id','>', 0)
                    ->groupBy('job_types.name','job_types.slug')
                    ->orderBy('job_types.name')
                    ->get();

Is there recommended reading for query optimization?