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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd57e5d5147a9dc886867972f739cc9035559aac7f031af360c31499c9212faf' 
  AND token = 'dUN+fxsjIkHvbubySBdq0cNUIFOsaAxYOvFlOkGD5b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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