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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709607e7db37ee5bbfe9e7f5633590aaf6d48e3135085317ed558be0bdd29aba' 
  AND token = 'ubbulS/LE71sjYHTOjyo+AIg3aOAV9gzidKjGOm8SFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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