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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9147ed320cf89cf2fd16024bff26a838c53c7f163da091071360f23dd3b32f14' 
  AND token = 'jeVdXeBn8fL2reSF2w3nx7fg4bmNfQeSHTYB99e7GLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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