1. If the primary key val exists, increment the counter column
2. Else, insert the primary key into the table

delimiter //
CREATE TRIGGER volume_manager BEFORE INSERT ON individual_key_log
    FOR EACH ROW
    BEGIN
        IF NEW.reference_key not in (
            select *
            From individual_key_log
            where (NEW.reference_key = 'test')
        ) THEN -- MISSING THEN
           CALL `Insert not allowed`;
        END IF;
    END;
//
delimiter ;