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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd425b8d2427d7817cd9470e5ba82c4955f0af6fa62ffa06819e1348703a8b0' 
  AND token = 'A2HUyxlFWfd0oNarvttgnusIWGkkuTw6LWshn6NqKUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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