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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afd7555de0fbb981d9239eb5302a719802636b9e4c26a827598f78b9b703327' 
  AND token = '03/DhdcG5ajH83B15HA+yPWCTGzZMlo9KDwO3HKUFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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