MySQL中因字段字符集不同导致索引不能命中的解决方法

SELECT
 Orders. NO,
 GuidNo,
 Orders.CreateTime,
 sum(OrderItem.Quantity) AS Quantity,
 Brand. NAME AS BrandName,
 member.Mobile,
 Street AS deliveryaddress,
 Area
FROM
 Orders
INNER JOIN OrderItem ON Orders.GuidNo = OrderItem.OrderGuidNo
INNER JOIN Brand ON Brand.Id = Orders.BrandId
INNER JOIN member ON member.Id = 13
INNER JOIN memberaddress ON member.Id = memberaddress.MemberId
WHERE
 orders.GuidNo IN (
  SELECT
   orderpayment.OrderGuidNo
  FROM
   paymentrecord
  LEFT JOIN orderpayment ON paymentrecord.`No` = orderpayment.PaymentNo
  WHERE
   paymentrecord.PaymentMethod = 'MemberCard'
  AND paymentrecord.Payer = 13
 )
GROUP BY
 GuidNo;