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`INFORMATION_SCHEMA`.`KEY_COLUMN_USAGE` in INFORMATION_SCHEMA Db of MySQL
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What are the informations are available in KEY_COLUMN_USAGE Table? 
CONSTRAINT_CATALOG
CONSTRAINT_SCHEMA
CONSTRAINT_NAME
TABLE_CATALOG
TABLE_SCHEMA
TABLE_NAME
COLUMN_NAME
ORDINAL_POSITION
POSITION_IN_UNIQUE_CONSTRAINT
REFERENCED_TABLE_SCHEMA
REFERENCED_TABLE_NAME
REFERENCED_COLUMN_NAME

Above columns are exist in INFORMATION_SCHEMA.KEY_COLUMN_USAGE
Here It is helps to see what are the fields are linked as foreign key from master tables.

REFERENCED_TABLE_NAME is the master table. It has primary key column.
TABLE_NAME, which contains foreign keys columns.
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