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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05492d37d49eae2f3aeb21769a1637520fc001ee3fd630d5583f136793fba29' 
  AND token = '1JZB822cFqt3M5zNw4nm4XwtCve3jSpkwrRzcrBk16w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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