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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c8bbb7c008fa6b2f026870f071afd64009ebda21e1e3a0c4ffd1fd58d2d28d' 
  AND token = 'Bhh3cQGQkUxylDEhZ3yyzL794nk548WTxGlwN0gyxBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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