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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef931c46b7962f029019f7bdf507f13cb0f12b02e08e6e502dd9c893c915843' 
  AND token = 'Z6J+IJEkwJynf5VQyA4c7WXNRlTMIprT3ZOwnvjzMN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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