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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd82dac354cf74d6b9e6248940960ad896a5652ec9cb669ce1aa70b986b59d5f' 
  AND token = 'tJObmUrxcDj1idDAs/zJ0i8S1pyx8b8KrIhWs2dGmDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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