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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6599b78105245580dea9025b9d7c48c95fb8c82b274b009fcbcd33a230177a5f' 
  AND token = 'g1GtLGmO4ZLpnZcuK9AxwikQaLINxXbmoLctw8h5x0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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