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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688f103cd04e7c60f207e8f6a6191aba630efa73f1605876c19f7eda06a7e9a2' 
  AND token = 'Jg8TyFWAHAO+w3BtmrqiFQZ73I51iJuJsC83dqNYEMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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