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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b93dd7ab6a0f4cc1268f75ab7454118bb68284b8b31f434bc879eb7197d313a' 
  AND token = 'OxD9aXM3W6TuKLnpIPWRKctXIEmG1XHa1mdGDhG2pPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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