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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391b2c4630658d894c299421d1ae247d2d27a344968abee2397fc27e034bbb07' 
  AND token = 'J6DbNwFDIkAE04h53WAjG14B9CFkc63xnrVtO9gzBQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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