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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c031603a704dcde1a8672c9ac39643e954f50c46b1016f076897cbe3e94f1199' 
  AND token = 'awo3Ms5loUoRSp7MdJ4Qz8oRc3Ua31Vi0BF320Q4yuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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