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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a54050d19d8a9902b26914e94dc827c81d91443f0e806be6b34ce1e57762171' 
  AND token = '+NFpa2q7H8v6P1KhBKbnKckq9KhttktsLAy5lOVt1fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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