INTERSECT in MySQL

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You can use an inner join to filter for rows that have a matching row in another table:

SELECT DISTINCT records.id 
FROM records
INNER JOIN data d1 on d1.id = records.firstname AND data.value = "john"
INNER JOIN data d2 on d2.id = records.lastname AND data.value = "smith"

One of many other alternatives is an in clause:

SELECT DISTINCT records.id 
FROM records
WHERE records.firstname IN (
    select id from data where value="john"
) AND records.lastname IN (
    select id from data where value="smith"
)

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