左连接和多个AND语句

Question

使用this solution我尝试使用IN和GROUP BY来优化此查询以加快速度。它仍然低迷。使用||而且多个AND语句似乎还有更多我可以用更高级的MySQL查询来优化它？

SELECT 
    COUNT(HTG_ScheduleRequest.ID) AS current_job,
    HTG_TechProps.EmpNumber, 
    HTG_TechProps.EmpFirstName, 
    HTG_TechProps.EmpLastName,  
    HTG_TechProps.Veh_Number
     FROM HTG_TechProps 
        LEFT JOIN HTG_ScheduleRequest ON HTG_TechProps.EmpNumber = HTG_ScheduleRequest.SSR 
        AND HTG_ScheduleRequest.JobStatus IN (2,5,8,3,4) 
        AND RecordType = '1' 
        AND 
        (HTG_ScheduleRequest.ScheduleDateCurrent = CURDATE() || HTG_ScheduleRequest.ScheduleDateExact = CURDATE())  
        GROUP BY HTG_TechProps.EmpNumber ORDER BY HTG_TechProps.EmpNumber ASC