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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13043d0c03dfebb0e4bc22beee0484832e0975df6d8d624744f9c5a2ecd08cb3' 
  AND token = '37Ubn6OO+XFaREWSp7JDy2Df9M+hzPY0VivV7JXrpEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}