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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454ba048a174aeea60ee70b7eb8c05811b65c5036e183bbc4fec17689016b1a7' 
  AND token = '1EUd97AhRpUe3W/bCEavPxWPkvQCdIrSDEQkJ4A055k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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