sql - Optimize a simple JOIN or IN query -

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i have query:

select distinct id,                  label    bbproduct_cust   custno in (select custno                      customer                     slsrptgrp = '1996')         , deptno = '0'  order  label asc

explain shows

id  select_type         table           type  possible_keys          key            key_len  ref    rows                                            1   primary             bbproduct_cust    ind_deptno                                            91834  using where; using temporary; using filesort   2   dependent subquery  customer        ref   primary,ind_slsrptgrp  ind_slsrptgrp  3        const  4      using

it takes 2-3 seconds, , need optimized.

what options have?

use inner join, rather in select

something like

select distinct id,                  label    bbproduct_cust inner join         customer on  bbproduct_cust.custno = customer.custno  slsrptgrp = '1996'        , deptno = '0'  order  label asc

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