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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43b64ed13cd7af88ca5464313e429e3f1bc152fb91b4b6e713c1ac0fcb634d4' 
  AND token = 'oRzTYhYta7IBZyP+jYyloZPIrCZU9KtmQIKIECorLgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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