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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c153f4b5d13d10d57fab4328bef0e10bbe32eb982910d6a81189fa68a880b0d0' 
  AND token = 'UFjHmM4T6GaCMmIyH+9jTqUSudA5IuFSPwY0XcUQ2A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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