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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f7b4fec59a0ae984433733162353b1c833ae13edb41243c6057bde06b890a7' 
  AND token = 'IRcpWSCvyTgSzRjwVM505ScO4cnYxwUeY2LTg4JAaQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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