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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb528dd38c509a06fcef8fe88ec0804e6514f4056d351e7d41e3b26ec7c08a24' 
  AND token = 'uCju+tUTjo+aYFKH/sOdZaCq5XDIYp9MKsNM7Y9tkz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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