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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481ddd886cf934f83c786e437f7d103725fbe53f5cd60d20b01ec15c4d676a97' 
  AND token = 'iEugc9wDBwCRMWjD6pJpwye4sS2w8czV0JaG7cWl7eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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