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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd2934d119987510595859f4c8a6877a9aac05e19b87ad1cab141c430d692df' 
  AND token = 'lYoN6Hn4p6egSCRp9yt7LEs096UG7eCcTNdSrPKngNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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