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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f23cf3f7e902d62d0e52bcc7063d88981b8a8f340eb99f0f4b69fe6db024c39' 
  AND token = 'mSgZeDjP08pTw4vU/psl7mw92IaP5CZZvky6w7MnFWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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