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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915d81d17585962b89c25db983a168da3fb3665aaae22d6e11399632fd65cbd3' 
  AND token = '2OW4rEhC4BWf1iP0OKXJmc6m8WUW7Knx/TGZBYCINpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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