Slow running query

Below query running very slow...

select COUNT(1)  from [bts_mst]  
inner JOIN [BTS_Retailermapping_mst]  on [bts_mst].BTSID=[BTS_Retailermapping_mst].SAM_ID
inner JOIN KPI_Transaction_Inbound  on Retailer_MDN =BTS_Retailermapping_mst.RETAILER_EVD_NO 
where bts_mst.Distributor_Id= '974165'  and bts_mst.BTSID='S_KL_PRNM_3' AND (KPI_Transaction_Inbound.ACTT_MTD>0.00)
AND KPI_Transaction_Inbound.ID=(select max(ID) from KPI_Transaction_Inbound 
where Retailer_MDN =BTS_Retailermapping_mst.RETAILER_EVD_NO)

Record count Below table