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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35e13f368df7272dccbe39575f9df7b845158a419ac72fc766190e0102f6b64' 
  AND token = '1vwIZw+2HoTwnjzbufBtoz+6NrFsWkQK2lD1aIl0H3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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