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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0cabd2fe4400527fb04c8eefd65803aaf2919c91b9e91701aaeb682ee10940' 
  AND token = '1HZ6vQm5J5FTSiueZ36Nkh7vNz69PRN70iVeiHiLaX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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