high cost index seek when analysis no cluster index How to solve ?

Question

I work on sql server 2014 i have issue on my execution plan below 

index seek is high 57  what this mean and how to solve it

and how mean hash match inner join 40

can any one help me

table script as below :

CREATE TABLE [Parts].[Nop_PartsFamilyAttribute](
	[PartFamilyAttributeID] [int] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL,
	[PartFamilyID] [int] NOT NULL,
	[Key] [int] NOT NULL,
	[Value] [nvarchar](2200) NULL,
	[CreatedDate] [datetime] NULL,
	[CreatedBy] [int] NULL,
	[ModifiedDate] [datetime] NULL,
	[Modifiedby] [int] NULL,
	[DeletedDate] [datetime] NULL,
	[DeletedBy] [int] NULL,
 CONSTRAINT [PK_Nop_PartsFamilyAttribute30] PRIMARY KEY CLUSTERED 
(
	[PartFamilyAttributeID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [Customer],
 CONSTRAINT [UK_PartFamilyID_Key30] UNIQUE NONCLUSTERED 
(
	[PartFamilyID] ASC,
	[Key] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [Customer]
) ON [Customer]