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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137e1a3f11b5998b453a40157942025c3e935f86928c2fc88f971c39820eb656' 
  AND token = '66NlX1OmLhubI9RP0nXVIO+gpO5TQObWgQOLqU/YLVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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