SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f4682423f0ae3622f55428ca87cb8a6a3154e38474effb93129d32fc1f084c' 
  AND token = 'uJhCEZMKCYJGPHwXp8PAX9ZwUsskG/IDY6FVBNy1Iik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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