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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e2b2db241549471e059a793af0d30b1ed8dbb982ef8d8e8d7a786070d71758' 
  AND token = 'dtKWLileepcIwqZlXrNICo0KgsTXWh94NBtItpy5j6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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