SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191c22224ab0e8d019e26b457cab733aa058d15f487e72b2a56e0f7423df45d0' 
  AND token = 'BgNRBCrymTvjRDYafhfDAK4lVKZRvwIi25/ckGwmDAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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