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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833d9f1562efc0a70949d2ae8b0d30e9f399521fd29e67d623de8935f35b4a62' 
  AND token = 'lhoIcmDPRbAGbYwCS89bDlhhp33Ehgtt8T39ezBEnRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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