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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f75cde219861ab06a9e97a4c20396d69d40736a1dd65dcd5f8b6bccc0a3afc3' 
  AND token = '3vXewZJU77owG7l5+6c/J/Ynev7v6rb8yO9x/IPuelQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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