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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33addfacaf96e08fbe834a9b650ef64a2ec89250ce940104fe913083594aef3d' 
  AND token = 'kh7anLH8FfvuMlS1gUKlF5VzT7E5WCu+Qj3zNsXuAXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00798

JSON explain

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