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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afddbe2f45a7f936b3cbb404bb86d8b340ef7674a27c44cd5972ce02525282fc' 
  AND token = 'vPZYCSO5UbcctkHHGkQQMvY5bjdygvINT9KQuWDAO6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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