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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9060f5c76813c9e87d9ababe75360016cd8b608be04fba17ed40127b2ae3b1' 
  AND token = 'whUxckgeysU9ucYzse4oH/N6nNKh+h5JEKCJjo/6p34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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