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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cce0f46712272ba938c53a3418a76edba95089f2677455b03776538482d9cd' 
  AND token = 'Plqxgzlv7B4T6eLNZP3XgAy7e7CqIJh3MurMqXgE6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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