SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b836b24da72a00597f26ffe03535c01ae1e5d8ee8bf74002e16a2ad92a6a474' 
  AND token = 'JF6PZVhzzbyPlQzSSxvnCgCNTII9H6ZHdm/V/Q8gwFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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