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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0190f554934a5216806094cc4da42e9c9459dc51b2adfe52f4d837cb13e7014a' 
  AND token = '9nWdwsPi9TnvUtCO92KosageRMhTJt4ZN83/iweGPYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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