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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0f7759d66e8fb1f82216ef33aaecc9a3889320c0fa999fd2eef78afddb0824' 
  AND token = 'udH7ZGXnbNZcE7RyO47uQGtVvEAt7ut3qsgfo29alZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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