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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1282fbe91afd8621c517e2e1b4c1f94b8a3b689ec820b2fe09a3754e03121331' 
  AND token = 'M3zEMFzQilKUeXwZ6D9pAiHC0xlgqWX4VcrXisMqJUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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