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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673de580b5b10f1a017a91afcb576a92bfe88ffeefc2454176b32e76ee0d2ea2' 
  AND token = '6fxJiWBm6Y7yAQtv4UX3v1IFwN8fqqXT4ovZOqIep2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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