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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73df598983cab76dcb4f59356a759c118ec7793ff0da5d9c4650791187717a1' 
  AND token = 'Xu9a4Xx8UmMNXbgXVDhunTLBKPvy6K2BfgA8T0oHafk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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