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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25d033e695559cedd80a4c57774827ded33f7349b79bb58d85ba3c3e7a3231a' 
  AND token = 'lRWPzd2qY4gQ7UpzyO+sbKpBv4RR9Ncr7VJ5U5chWmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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