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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3456214a2bb32e1612209a2bccd652e24278faf1145f0bcf2249141f26c7e7' 
  AND token = 'BbdRsOgZZ9/keZK2OeTndpEJDHSyTr8zCjtLurGr1QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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