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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417b6195343065141d7d9b75bed268c8cfa8ceb95d8e33fc900c957e5d623791' 
  AND token = '7HCrSgfayeVQOf3HeRkpgdA+JYTZlc6mIt1N5L73sEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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