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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fae7c6744ba5faf7787ab75a520500888292b4feda67b2d6ce8055062f6b5c1' 
  AND token = 'HmXZ9qrxnxFx9EJkTw2LXJQrMX84Jd9TatqAaue0pCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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