Optimize inner join code on LTAP and LTAK

Hallo.

I'm a newbie on ABAP.

I note a bad performance on the code:

  SELECT COUNT(*)

    FROM ltap AS a

    INNER JOIN ltak AS b

    ON a~lgnum EQ b~lgnum

    AND a~tanum EQ b~tanum

    INTO row_conf

    WHERE a~lgnum EQ p_mag

      AND a~pquit NE 'X'

      AND a~nltyp EQ '916'

      AND b~bdatu LE p_day.

How could I optimize it?

Could you give some suggest, please?

Thanks a lot for your help.

Mario