SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb335537b4f7bc777a36e73d27073aead2243c7bb8d5954c20ce524dc6b6be53' 
  AND token = 'cRfjAKMfgwY4SoHmFav9k2mWRGT6nATcgs0pCxpQ++o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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