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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24feeaa6d8b87a0bc3503e1afd0e6ae049986e310b56be50e2a0de373b410337' 
  AND token = 'k8ZfmWOoeu4FoEU+zC9oDaJMVih+skugcL88Vhc8rak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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